Blow-pipe



(No Model.)

G. D. GOWEN.

BLOW PIPE.

No. 320,461. Patented June 23, 1885.

WITNESSES IIVVENTOR MW Affarney N ETERs. Phowmho hu. wa-hin tm n. c.

UNITED STATES PATENT OFFICE.

GEORGE D. COVVEN, OF TAUNTON, MASSACHUSETTS.

BLOW-PIPE.

srncrmca'rrorr forming part of Letters Patent No. 320,461, dated June 23, 1885.

Application filed July 2, 1884. (No model.)

the construction of that class of blow-pipes in which agas-jet and a blast of air are employed, and which are used by jewelers,tinsmiths,and n:eta1workers generally and it consists in certain novel details of construction, which I will now proceed to describe.

In the accompanying drawings, Figure 1 is a side elevation of my improved blow-pipe supported in its stand; Figs. 2 and 2, longitudinal sectional views of the same Fig. 3, a perspective view of the valve removed and Fig. 4, a view of the stand for supporting the blow-pipe.

Heretofore it has been usual,when the operator has finished using the blow-pipe, to shut off the air blast and then turn off the gas at the bracket, and the next time it was necessary to use it turn on the gas and light it, or instead of this he would shut off the blast of air and leave the gas burning, thereby not only wasting the gas but injuring the blowpipe. All these disadvantages are overcome, however, by my improved construction.

A represents a tapering tube of metal open at its outer end, and provided with a smaller tube, B, extending to within a short distance of its open end. This tube B is connected by a rubber tube, 1), with a fan, bellows, or any other suitable blast-creating mechanism, and the outer one is connected to a gas-bracket by a tube, 1), as shown. Near the center of the blow-pipe is a rotary valve, 0, provided with perforations a a and b, the two former for the passage of the gas, and the latter located between them for the blast. To the valve is attached one end of a spring, D, its other end being attached to a pin, d, soldered or otherwise secured to the blow-pipe, and the tendency of this spring is to keep the valve 0 open, it being prevented from turning too far by a pin, d, placed in the path of the arm D. The curved arm D is also secured to the valve, and this arm is adapted to co-operate with the stand E to keep the valve closed when the blow-pipe is placed thereon, as will be presently explained.

E represents a stand fastened to the workmans bench by having its sharpened end driven therein, or otherwise supported in any other suitable manner, and it is preferably formed of stout wire'bentinto the shape shown, or it may be made in'any other suitable manner, as all that is necessary is to have the forward portion,E,bent so as to extend over the outer end of the blow-pipe, and the portion E extending under the same and supporting it, as shown in Fig. 1.

It will be noticed that the valve 0 (shown in Fig. 3) has a slight groove all the way around it, and in line with one or both of the perforations a a,communicating with the gas-tube, and the object of this groove is to allow a small stream of gas to pass the valve when the gas and air are turned off and permit a small flame at the mouth of the tube, so that when the blow-pipe is to be used again it will not be necessary to light the gas, as a small flame is always kept burning. This flame is so small that its cost would amount to a very little,or nothing.

The operation is as follows: hen the blow I pipe is in use,the spring connected to the valve 0 causes the latter to remain open and permits a full head of both gas and air, and when the operator has finished using the blow-pipe he replaces it in its stand E by putting its forward end under the forward'projection of the stand and sliding it forward until the end of the arm attached to the valve strikes the rear portion of the stand. Now the weight of the tubes a b will keep the forward end pressed against the forward portion of the stand, and the rear end or rather middle portion will be supported by the rear fork with the arm D of the valve resting against it, thereby shutting off the gas,with the exception of the small jet which is always lighted. Now, when the operator again wishes to use the pipe all that is necessary is to removeit from the stand,when the valve will be again opened by the spring, and the gas and blast turned on.

The abovedeseribed blow-pipe can be manscribed.

ufacturcd at little expense, and gives a very hot fiame,and the advantage of cutting off the gas and air when the instrument is laid down even temporarily is immense; also that of keeping a very small flame burning all the time.

I do not desire to be confined to the precise details of construction shown, as other means the equivalent of those shown might be used to accomplish the same object.

Having thus described my invention,l claim as new 1. In combination with the air and gas pipes, the valve for shutting off the gas and air blast, and a stand for the blow-pipe with which said valve co-operates,whereby when theblow-pipe is placed in the stand the gas and air blast will be turned off, substantially as described.

2. The coinbinatiomwith the blow-pipe provided with the valve opened by the spring and having the arm, of a stand for supporting the same, and so constructed that when the blow-pipe is placed in the stand the gas and air blast will be shut off, substantially as de- 3. The blow-pipe provided with the valve the internal air-tube and the external gas-tube,

the valve perforated and grooved, as described, the arm attached thereto, and a stand or support,against which said arm is caused to press and so turn the valve by the weight of the pipes, substantially as described.

6. In a blow-pipe, and in combination with the blast and gas pipes, a valve provided with an actuatingarm, and a stand or support for the pipe, adapted, when the latter is applied, to makecontact with the arm. and thus actuate the valve, substantially as described.

GEORGE D. OOVVEN. Witnesses:

JOHN C. REYNOLDS, ELISHA T. J AOKSON. 

